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To find out the IP address of the router machine B sites behind... have someone (you or someone else) visit www.whatismyip.com from a machine BEHIND the router or they can log into the router and check the status page. There are quite a few more ways, but they are the easiest IMO.

If you are going to be logging into machine B on a regular basis and the WAN IP is always changing... you may want to look into dynamic dns. I use dyndns.org and I've seen support for dyndns.org in many home routers.

As sirdice said, make sure you forward port 22 on the router to the internal host (machine b).

In that case, it makes most sense to set machine B with a static IP on their private network so the port forwarding will always work. If the private IP address of machine B changes all the time because it is getting its ip address from DHCP, then you'll have to constantly remap the port forwarding.

Port triggering would not work in this case because machine B won't be initializing the communication.

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